775621 has 12 divisors (see below), whose sum is σ = 984960. Its totient is φ = 603960.

The previous prime is 775613. The next prime is 775627. The reversal of 775621 is 126577.

It is not a de Polignac number, because 775621 - 2³ = 775613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 775621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2⁷⁷⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

775621 is a deficient number, since it is larger than the sum of its proper divisors (209339).

775621 is a wasteful number, since it uses less digits than its factorization.

775621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 1457 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 775621 is about 880.6934767557. The cubic root of 775621 is about 91.8790549987.

It can be divided in two parts, 7756 and 21, that added together give a palindrome (7777).

The spelling of 775621 in words is "seven hundred seventy-five thousand, six hundred twenty-one".